Charles e



(No Model.)

- 0'. E. LONGDEN.

SYRINGE.

No. 470,430. Patented Mar. 8, 1892.

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CHARLES E. LON GDEN, OF NEIV HAVEN, CONNECTICUT, ASSIGNOR TO THE 1SEAMLESS RUBBER COMPANY, OF SAME PLACE.

SYRINGE.

SPECIFICATION forming partof Letters Patent No. 470,430, dated March 8,1892. Application filed F b uary 8, 1892. Serial No. 420,694.. (Nomodel.)

To all wham it may concern:

Be it known thatI, CHARLES E. LONGDEN, of New Haven, in the county ofNew Haven and State of Connecticut, have invented a new Improvement inElastic-Bulb Syringes; and I do hereby declare the following, when takenin connection with accompanying, drawings and the letters of referencemarked thereon, to be a full, clear, and exact description of the same,and which said drawings constitute part of this specification,and-represent, in

Figure l, a viewin longitudinal central section of a syringe-bulbprovided with a coupling, a collar, and a tube constructed and appliedin accordance with my invention, the coupling being shown in elevation;Fig. 2, a detached sectional view of the bulb, showing the normal orstretched condition of its necks;

Fig. 3, a similar view of the coupling for one of its ends, thevalve-coupling being shown; Fig. 4, a detached perspective view of thecollar, and Fig. 5 a sectional View showing a modified form which myinvention may assume.

My invention relates to an improvement in elastic-bulb syringes, theobject being to provide simple, convenient, and effective couplings forconnecting their bulbs and tubes.

With these ends in view my invention con sists in a coupling comprisinga hollow head having at one end a knob for insertion into the bulb, ahub of larger diameter than the said knob andadapted at its opposite endto have a tube attached to it, and a collar constructed to be secured tothe said hub with one of its ends forced against the bulb to grip thesame between it and the said knob. My invention further consists incertain details of construction and combinations of parts, as will behereinafter described, and particularly recited in the claims.

As shown in Figs. 1, 3, and 4 of the drawings, my improved couplingcomprises a hollow head A, having a knob A A at its respective ends, aperipherally-threaded hub A of larger diameter than the said knobs,located midway of its length, and an internally-threaded collar B,constructed to be passed over and secured to the said hub. I do not,however, limit myself to a head having knobs at both ends, for, ifdesired, the

outer end of the head. may be otherwise adapted than by a knob forattachment of the tube C.

In using my improved coupling the knob at the inner end of the head isforced into the elastic bulb C, after which the collar is passed overthe hub and moved toward the bulb until its inner end has gripped thesame between it and the knob, as shown by Fig. l of thedrawings, thebulb being deflected, as it were, over the inner edge of the said knob.The bulb itself may be of any approved construction; but preferably itis of oval form and has tapering ends contracted to form necks, whichare expanded when the knobs at the inner ends of the heads areintroduced into them.

In the modified construction shown by Fig. 5 of the drawings neitherthe'hub D of the head nor the collar E are threaded; but in this casethe collar is made of hard rubber and is heated when applied to the hub,its contraction upon cooling being relied upon to secure it in positionupon .the hub. The broken lines between the inner end of the collar andthe adjacent portion of the bulb in this figure show, approximately, howmuch the collar is forced inward onto the bulb after its first contacttherewith in order to secure the gripping action before set forth.

The coupling at one end of the bulb is provided with a valve a, as shownby Fig. 3 of the drawings, this valve being of ordinary construction.

I would have it understood that I do not limit myself to the exactconstruction herein shown and described, but hold myself at liberty tomake such changes and alterations as fairly fall within the spirit andscope of my invention.

Having fully described my invention, what I claim as new, and desire tosecure by Letters Patent, is

1. In an elastic-bulb syringe, the combination, with the bulb thereof,of a coupling comprising a hollow head having a knob for insertion intothe bulb at one end, and a hub of larger diameter than the said knob andadapted at its opposite end to have a tube attached to it, and a collarconstructed to be passed over and secured to the said hub with one ofits ends forced against the bulb to grip the same between it and thesaid knob, substantially as described.

2. In an elastic-bulb syringe, the combination, with the bulb thereof,of a coupling colnprising a hollow head having a knob for insertion intothe bulb at one end, and a peripherally-threaded hub of larger diameterthan the said knob and adapted at its opposite end to have a tubeattached to it, and an internally-threaded collar constructed to bescrewed over the said hub, one of its ends being forced against the bulbto grip the same between it and the said knob, substantially asdescribed.

In testimony whereof I have signed this Specification in the presence oftwo subscribing witnesses.

CHARLES E. LONGDEN.

Witnesses:

FRED O. EARLE,

LILLIAN D. KELSEY.

